Television and telephoto device



' 1931- J. L. WALKER TELEVISION AND TELEPHOTO DEVICE Filed Nov. 9. 1928 LWJKM. INVENTOR Patented Oct. 13, 1931 PATENT OFFICE no]: L. or DALLAS, arms v rnnnvrsron I, arm rmmoro navrcn w n tion Q1011 Iuvenber 9, 1888. Serial No. 318,183.

This invention relates to new and. useful improvements in intensifying light images or light rays acting upon a viewing frame or upon a sensitized plate or other material capab-le of receiving a photographic impression whereby the speed at which the photograph may be made will be approximately doubled if a photograph is to be made of said light images, or a viewing frame of approxito malely twice the size possible without my invention can be used if'the light images. are to be viewed with the eye. i

The invention has to do with that class of recording and reproducing devices which involve the use of electricity, photography and mechanical means and whereby a varying beam of light is distributed over the surface of a viewing screen or upon a photographic film or plate. 7

The object of the invention is to provide a method of illumination that will intensify the light rays more than can be done with the usual methods, and approximately double the light intensity by causing two separate beams of light to strike each other from opposite directions and allow light rays to be condensed vfrom an area, of a proximately 360 degrees horizontallya vertically.

Another object of the inventionis to speed up the photographic process soqthat messages or pictures canbephotogra hedin approximately one half the time I is possible without the invention. a

7 Still anotherobject of the invention to increase the light intensity sothat approximately twice as large a picture can bereproduced in aviewing frame as would be possible without the invention. f

In carrying out theinvention; one system of receiving television pictures will be described but it is understoodthat many other systems may be used with the invention.

It is well known that inreceivingimages in television and telephoto work, some sort of distributor is used to distribute lightrays over an area used for reproducing the picture which is transmitted by a similar distributor F and whereby small pointsof light at the 39 transmitting station are distributed over a lpicture or object successively until all points ave been covered by said points of 1' These points of light striking the picture or object are caused to influence a photoelectric cell or device capable of changlng its resistance with the amount of light strikin it and further control the transmission 0% electric waves either by radio or wire as des sired. At the receiving station a similar distributor is used to distribute the received impulses or light rays transformed from them in the same relation upon a screen or photographic plate so that the image of light at the receiving station will appear at the same point, of the receiving frame as the point of light occupied at the transmitting station at the same relativeinstant.

At the transmitting station a disc is used containing a series of holes near its outer edge. These holes are in the form of a: spiral and spaced apart from each other in such a way that in rotating the disc one of .the holes will travel a distance equal to that used for the framing of the view to be transand cover the entire area of said framing in a narrow line from one side to the other before the next hole will traverse theframe from one side to the other. Each succeeding hole will travel across the said frame from one side to the other and be 8 spaced approximately the width of a hole nearer the center of the said disc so that .a portion of the transmitted icture or object will be explored just .undertlie path of the preceding hole. This spacin should he such that there is no overlap of .t e light affected area and so that no perceptible separation occurs.

At the receiving station a similar .81- rangement is used for distribution of images, received in the form :of eleotrwal waves which are again restored to light images. The electrical waves are transformed into light rays by anysuitablemeans such ,as the mercury arc, neon lamp or even a small filament lamp. These light rays are projected upon .a screen mounted in .a frame or upon a photossermitive film or material from both sides so that the images exactly register upon each side and combine to increase the illumination to twice what it would be from one side only. Two lamps are used, one on each side of the viewing frame or film to show the principle, but it is understood that more than one lamp might be used on each side of the film if desired although no invention would be involved in such use of the lamps as it would be mere duplication without a change of function. lVith more than one lamp on each side of the film the lamps would necessarily be placed at a greater distance and would therefore be less intense. One large lamp would be equivalent to a group of smaller ones and it is impossible to illuminate from a greater area than 180 degrees rrom one side of any object.

Two discs are mounted upon one shaft attached to a 60 cycle synchronous motor and are spaced far enough apart so that two photographic lenses may be mounted between them and project an image of each dlsc upon a ground glass or a photographic film. These discs contain holes exactly alike and are monted upon the shaft in such a manner that the light collected from one of the holes in one of the discs will be projected by one of the photographic lenses to a point on one side of the ground glass or film which will exactly register with the light collected from the other disc and which is projected upon the opposite side of the ground glass or film by the other photographic lens.

The method obviously requires that the received waves be amplified to such extent that both lamps are receiving the proper amount of current for satisfactory operation and the addition of more stages of amplification like the addition of lights on one side of the film or ground glass would not be novel. In operation the holes in the rotating discs are illuminated and as they travel from one side of the viewing frame or film to the other they produce semicircles of light, or light and dark portions, one underneath the other, until the light has traveled from the top to the bottom of the said frame-or film, and if the picture is viewed with the eye the impression of the first line of light and dark portions will be retained on the retina due to the persistence of vision until the last line is finished providing the time is not too long between the time of the first and the last hole being projected upon the screen, contained in the viewing frame. At the present time pictures can only be made up to one and a half by one and a half inches square by other methods than the one described herein. It will, therefore, be obvious that with a disc twice the size of the present discs and with twice the number of holes a picture twice the one and a half by one and a half size can be reproduced if the rotating speed is the same and the light intensity can be doubled.

It will also be obvious that two messages or two pictures could be reproduced in the same time that it takes to reproduce one with other methods than mine.

The motor used to turn the discs is of the synchronous type and 60 cycle alternating current is used to drive it and as is well known revolves in synchronism will the generator at the power supply station. It will be easily seen that areceiving station in the same city will have no trouble in maintaining synchronism with the transmitting station providing they both use from the same alternating current supply system. In other cities; the U0 cycle current may vary a little from the transmitting city and some form of regulator or synchronizing means maly be necessary.

he invention will be more readily understood from a reading of the following specifications and by reference to the accompanying drawings in which an example of the invention is shown.

Fig. 1 shows a perspective view of an apparatus designed to show the principle of my invention.

Fig. 2 shows a front elevation of a cover for protecting the sensitized film from the action of all light except that projected by lenses in the lens tubes.

In the drawings numeral 1 designates a wireless receiver and amplifier unit for receivin television waves transmitted by wireless. 1 umerals 2 and 3 designate illuminating lamps of the neon type connected by conductors 4 and 5 to receiving unit 1 and are adapted to illuminate in accordance with the fluctuations in received signals received from a television broadcasting station with which it is tuned. Any good wireless receiving and amplifying set will suflice but one free from distortion on all frequencies is preferable. Numerals 4 and 5 designate perforated discs firmly attached to shaft 6 of motor 7. N umerals 8 and 9 designaie wires connected to motor 7 and are to be connected to any 60 cycle alternating current supply. Numerals l0 and 11 designate lens tubes containing photographic lenses matched in focus for collecting the light projected through holes in discs 4 and 5 from lamps 2 and 3. Numeral 12 designates a frame containing a ground glass screen or photographic film 13 upon which the light rays projected from lenses in tubes 10 and 11 are focussed. Nu meral 14 designates a mounting block upon -which the various parts are mounted, excepting the receiver 1, mentioned above. Numerals 15 and 16 designate brackets on base 14 for supporting lamps 2 and 3. Numeral 17 designates a bracket on base 14 for supporting motor 7. Numeral 18designates a bracket mounted on base 14 which carries a bearing 19 for shaft 6. Numerals tZOand 21 designate brackets for supporting lens tubes 10 and 11. Numeral 22 designates a bracket supporting frame 12. Shaft 6 extends through brackets 20, 22 and 21 through which it revolves. Numeral 23 designates a receiving aerial and numeral 24 a ground connection for receiver 1.

Numeral 25 designates a cover of metal or other light proof material designed to slip over the base 14 and exclude all light except that entering through lens tubes 10 and 11 and is designed to fit close to brackets 20 and 21, and is to be used when exposing a sensitized film to the light images projected through lens tubes 10 and 11 so that they will receive no light except that intended to be photographed. N umeral'27 designates a'slot into which screw 26 fits.

What I claim is 1. The method of illuminating a photographic plate or viewing screen which consists of using light from two separate light sources and projecting light from one light source upon one side and from the other light source upon the other side of said photographic plate or viewing screen and combining the illumination from two separate light sources at one point 2. The method of illuminating a photographic plate or viewing screen which consists of using light from two separate light sources and projecting light from one light source upon one side and from the other light source upon the other side of said photographic plate or viewing screen and combining the illumination from two separate light sources at one point and causing the light from both light sources to exactly register at the same point on said photographic plate or viewing screen and causing both light sources to be projected the same size upon each side at the point of register.

3. The method of illuminating a photographic plate or viewing screen which consists of registering upon said photogra hic plate or viewing screen images of light rom two separate light sources with lenses projecting light from one light source upon one side and from the other light source upon the other side of said photographic plate or viewing screen and using a distributing means upon each side for distributing the light rays from one light source upon one side and from the other light source upon the other side, and causing the distributing of light from. both sides at the same point of register on said photographic plate or viewing screen.

4. The method of illuminating a hotographic plate or viewing screen whio consists of projecting from each side of said photographic plate or viewing screen images of light from a light source on each side and distributing said images of light from each side by two separate distributing means rotating synchronously.

5. The method of illuminating a photosists of projecting from each side of said photographic plate or viewing screen images of light from a light source on each side and causlng both light sources to fluctuate simultaneously and in the same degree.

6. The method of illuminating a sensitized film or a viewing screen which consists of simultaneously projecting upon each side of said sensitized film orsaid viewing screen, images of light from a light source on each side of said sensitized film or said viewing screen and using a distributing means whereby minute portions of said sensitized film or said viewing screen will be acted upon by said distributing means on each side and causing each distributing means to register at the same point simultaneously but from different sides of the said sensitized film or the said viewing screen.

r 7. The method of recording images which consists of causing the fluctuations received from a television or telephoto station to vary the intensity of light rays upon both sides of a photographic film or viewing screen and causing a distribution of said light ra s to be made on each side of said photograp ic film or viewing screen and causing lenses upon both sides of said photographic film or viewing screen to focus the said light rays sharply at exactlythe same point from opposite directions whereby said images of light will exactly match both in size and position upon said photographic film or said viewing screen and increase the illumination.

JACK L. 'WALKER. 

